Automatic tension device for bobbins



J; v. MANN 2,109,543

March 1, 1938.

I AUTOMATIC TENSION DEVICE FOR BOBBINS Filed May 16, 1935 INVENTOR.

BY I. /7 Zcmn/ ATT RNEY.

Patented Mar. 1, 1938 UNITED STATES PATENT OFFICE AUTOMATIC TENSlONDEVICE FOR nonams tion of New York Application May 16, 1935, Serial No.21,857

2 Claims.

The present invention relates to an automatic tension device for bobbinsand more particularly an automatically variable retarding device forbobbin holders used in spinning frames and the 5 like.

In the various operations of manufacture and handling yarn or othertextile material in which the material is handled in package form, it isdesirable that the tension on such material be ac- ,0 curatelycontrollable at all times, and that a high degree of uniformity oftension be obtainable regardless of the diameter or weight of thepackage.

Moreover, whereas a low tension is desirable as permitting the use ofless twist and a correspondl5 ing increase of draft, without danger ofbreakage,

on the other hand it is necessary to avoid overrunning of the package soas to produce slack. This overrunning of the package may occur in caseof breakage, and in some installations by vibration of the frame, alsoby the use of air blasts to clean the machines.

It is an object of the present invention to provide a novel retardingdevice for packages of yarn or other wound textile material which isefiective and reliable in operation and simple and economical inconstruction.

It is another object to provide such a device which is automaticallyvariable in its eifect in accordance with the diameter of the package.

It is a further object to provide such a device which is readilyadjustable and adaptable to various types of installations andconditions.

It is a further object to provide such a device which may be arranged toprovide substantial 35 uniformity of tension throughout the unreeling ofa package, or may be arranged to gradually vary such tension in anydesired manner.

Further objects and advantages will be apparent from the followingdescription taken in connection with the accompanying drawing in which:

Fig. 1 is a side view of a preferred embodiment of the invention;

Fig. 2 is a plan view of the sameon a reduced scale; and

Fig. 3 is a side view on a further reduced scale of the device appliedto a conventional skewer mounted bobbin. I

Referring first to Fig. 1 of the drawing, there 50 is illustrated aportion of a package I of yarn or roving which is pendulously supportedfrom a creel board 2 by means of an anti-friction bobbin holder 3 of awell-known commercial type.

In this installation the bobbin 4 is supported by 5 the bobbin holder 3with freedom for limited universal movement, the bobbin holder 3 beingattached rigidly to the creel board 2 by means of a bolt 5 traversing anopening in the creel board and secured thereto by means of a nut i. Itwill be understood that tightening the nut 6 clamps 6 the creel board 2between the nut 6 and the dust cap I of the bobbin holder.

According to the present invention, a weighted retarding membenin theform of a smooth bar I of suitable material such as steel which isprefi0 erably provided with a polished coating such as chrome or cadmiumplate, is arranged to bear frictionally on the periphery of the yarnpackage I. For this purpose the bar 8 is pivotally connected, at one endas indicated at 9 to a mounting 16 member II in the form of a wire whichis bent upon itself so as to embrace the bolt 5 of the bobbin holder,and is provided with inturned ends l2 pivotally engaging an opening l3in the end of the bar 8 (Fig. 2).

The mounting member II is clamped between the dust cap I of the bobbinholder and. the creel board, a suitable washer l4 being preferablyinterposed adjacent the creel board; and provision for longitudinaladjustment of the retarding mem- 5 her 8 is made by forming the mountingmember H as an elongated loop which, when the nut 6 is loosened, permitsthe pivot 9 of the retarding member to be moved toward or away from thevertical axis of the yarn package.

During the unreeling operation, it is well known that in someinstallations the tension on the yarn is considerably less when the yarnpackage is full than when the bobbin is nearly empty, since the radiusfrom the surface to the axis of the full yarn package is greater and thedraft of the yarn consequently has a greater leverage to turn thebobbin. This is true even though there is somewhat more friction in thebobbin holder due to the weight of the full package, especially where 40anti-friction bobbin holders are used in which the friction is at alltimes quite low. An analogous effect is also observable with respect todisturbances caused by air blasts used for cleaning purposes, whichdisturbances will obviously be greater as regards undesired rotation ofthe yarn packages when the packages are full. It is desirable,therefore, that a retarding means be provided which produces acomparatively large braking eifect on a full package, which brakingeffect diminishes progressively as the diameter of the packagediminishes.

In operation, the above-described structure accomplishes this desiredfunction in an effective manner. Since the retarding element ,8

effectiveness is obviously greatest when the package is full, and leastwhen the package is exhausted as illustrated in dotted lines in Fig. 1.Moreover, it will be readily apparent that the relative braking effectexerted by the retarding .member on packages of varying sizes may beeasily and positively controlled by moving the pivot 9 of the retardingmember toward or away from the axis of the package. The pivot 9 may alsobe moved vertically by bending the supporting element ll if desired,whereby practically any desired variation in braking eflfect may besecured. Thus, moving the pivot 8 toward the axis of the yarn package orlowering the pivot decreases the variation in braking eifect whilemoving the pivot outward, or raising it will increase the variation inbraking efiect.

It will be appreciated that the retarding element 8, due to its suitablecurvature, does not interfere in any way with the mounting ordismounting of the yarn packages on the bobbin holder, and that theweight of the retarding member 8 is selected or adjusted to produce thedesired efl'ect in each type of installation in which it is adopted.-

Fig. 3 illustrates the invention as used in connection with an ordinaryskewer-mounted yarn package l5. In this case the bobbin I6 is mounted ona skewer I'I which rests at its lower end in a suitable bearing I! onthe lower creel board, and is guided at its upper end by a bearingthimble I! mounted in the upper creel board 2|. The bearing thimble I9is attached to the creel board by suitable means such as screws 22, andthe mounting member H is clamped between the 2,109,543 bears on theperiphery of the yarn package, its

bearing thimble and the creel board so as to support the retardingmember 8 in the desired posi-- tion.

Although but one form of the present invention has been shown anddescribed in detail, it will be understood that other forms are possibleand that changes may be made in the design and proportions of the partsand in their means of attachment and application without departing fromthe spirit of the invention as defined in the claims appended hereto.

What is claimed is:

1. In a spinning frame, a creel board, a bobbin for a yarn package, avertical pivotal support therefor including a bearing member fixed tothe creel board above the bobbin, a brake member in the form of a baradapted to bear on the surface of the yarn package, and a hinge memberfor the brake clamped by said bearing to the creel board.

2. In a spinning frame, a creel board, a bobbin for a yarn package, avertical pivotal support therefor including a bearing member fixed tothe creel board above the bobbin, a brake member in the form of a baradapted to bear on the surface of the yarn package, and a hinge memberfor the brake clamped by said bearing to the creel board, said hingemember having an elongated opening therein to receive the bearingwhereby the pivot for the brake may be moved laterally to vary therelative braking effect with yarn packages of different sizes, and thuscompensate for variations of friction in the pivotal support.

JOHN v. MANN. an

